Shift transmission-gearing.



H. C. DREISVOGT. SHIFT TRANSMISSION GEARING. APPLICATION TILED MAY12,1909.

$83,211 Patented Jan.31,1911.

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H. C. DRBISVOGT. SHIFT TRANSMISSION GEARING. APPLICATION FILED HAY12,1909.

Patented Jan. 31, 191 1.

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H. C. DREISVOGT. SHIFT TRANSMISSION GEAR-ING. APPLIGATION FILEDMAY12,1909.

Patented J an. 31, 1911.

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TINITED SHIFT TRANSMISSION-GEARING.

To all whom it may concern:

Be it known that I, HERMAN C. Dnmsvoor, a citizen of the United States,residing at Chicago, in the county of Cook and Stateof Illinois, haveinvented a new and useful Improvement in Shift Transmission-Gearing, ofwhich the following is a specification.

The object of my invention is to provide a simple mechanism forautomobiles and other power machinery by which various changes of speed,and a reversible mot-ion may be made in the driven mechanism and thedriving and driven parts be disconnected while the speed and directionof the driving power remains unchanged.

The manner in which I accomplish my object is described in the followingspecification and illustrated in the accompanying drawings in which;

Figure l is a top plan view of a box containing the gearing with partbroken away to show a sliding plate and ends of crank shafts and rollersthereon. Fig. 2 is a 1011- gitudinal vertical section on the line 2 2Fig. 1, showing the driving and countershafts, gear wheels, and clutchesthereon, and crank shafts by which said clutches are moved. Fig. 3 is avertical cross section on the line 3-8 Fig. 2, showing the relativepositions of the crank shafts and clutches and their connection. Fig. 4:is a vertical cross section on the line l-t Fig. 2, showing positions ofdriving and counter shafts, gear wheels thereon and intermediate gear inmesh therewith by which the reverse motion of the driven parts is made.Fig. 5 is a side elevation showing the top ends of the crank shafts withrollers thereon. Fig. 6 isa top plan of the parts shown in Fig. 5. Fig.7 shows part of the driving and counter shafts. These are angular insection and are journaled for the bearings for the gears. Fig. 8 is aside elevation showing the construction of the gears which are providedwith split center bearings to fit the journals on the angular shafts.Fig. 9 is a vertical cross section on the line 99 Fig. 2, which showsthe shape of the crankshafts and their contact with the clutches. Fig.10 and Fig. 11 are central sectional views of the lower and upperclutches and gears shown at the right end of Fig. 2 and in the center ofFig. 9 through the center of the shafts. Fig. 10 shows the lower clutchclosed. Fig. 11 shows the clutch Specification of Letters Patent.

Application filed. May 12, 1909.

Patented Jan. e1, 1911. Serial N 0. 495,555.

open and the connecting shafts by which a direct drive is obtained whenall other clutches are out of contact with their respective gears. Fig.12 is a side elevation of one of the clutches, and Fig. 13 is a sideelevation of one of the gears. Figs. 14, 16 and 17 are enlarged detailviews of parts shown in Figs. 1,2 and 9, and Fig. 15 is an enlarged viewof parts shown in Figs. 1 and 2.

In the drawings A indicates a box "in which the mechanism is supportedand inclosed, A are bearings therein, A is a stud bearing shaft in theleft end of the box. Supported in the bearings A is a driving shaft Badapted to be coupled at the external end B with any suitable motivepower. The opposite end within the box is bored in the center to admitthe end of a shaft O supported in the bearing A in the right end of thebox, and which is adapted to be rotated with the shaft B orindependently. The external end C of this shaft is adapted to be coupledwith any mechanism suitable to be driven thereby. Parallel with theshaft B is a counter shaft D. The shafts B and D are angular in sectionand are journaled to fit the bearings in the box A and for the supportof gear wheels within the box. Rotatably supported on the journaledparts of the shaft B are gear wheels E, E, and E Slidably supported onthe angular parts of the same shaft and rotatable therewith are clutchesE E E and E9. Rotatably supported on the journaled parts of the shaft Dare gear wheels F, F F and F Slidably supported on the angular parts ofthe same shaft are clutches F, F F, and F Fixed on the shaft C is a gearwheel 0 which is permanently in mesh with the gear wheel F Rotatablysupported on the stud shaft G is a gear wheel G which is permanently inmesh with the gear wheels E and F. The gear wheels E and F arepermanently in mesh, and so are the gear wheels E and F Each of the gearwheels E, E E F, F and F are constructed with a split center piece II.These are bored to fit the journaled parts of the shafts B and D, andeach piece has two clutch teeth II and are connected, and secured in thegear by rivets H Each of the clutches E 13*, E, F F and F are equal indiameter and each one has an annular groove I and two teeth adapted toengage the teeth of the gear wheels. The clutch F differs from the otherclutches in the increased diameter of the grooved part for the purposehereinafter described. Supported in the bearings J and J are crankshafts K. These shafts are arranged in pairs and each pair is adapted toengage and move two clutches, one on shaft B the other on shaft D. Eachshaft has three cranks, a top crank K a middle crank K and a bottomcrank K. On the crank K is a roller L supported on the crank pin L Thedistance from the longitudinal center line of the shaft K and center ofthe crank pin L is the same in all, and the length of the radius of thecranks K and K are equal.

The crank shafts are arranged in the box A so that the cranks K and K ofeach pair are rotatably engaged in the grooves l of their respectivepair of clutches, one on the shaft B and the other on the shaft D androtatable between said crank shafts as shown in Figs. 2 and 3. Therollers L are engaged in a bar M. This bar is flat and extendslongitudinally through suitable bearings in the ends of the boximmediately beneath the top. In this bar are two slots M and M extendingthe length of the bar and parallel except in the central part M wherethe slots converge in a V shape. In these slots the rollers L on thecranks K are engaged and free to rotate by the sliding movement of thebar, and the cranks K of each pair of crank shafts are partly rotated astheir respective rollers enter and leave the converging parts M of theslots. The crank shafts K thus partly rotated move the clutches engagedby the cranks K and K into engagement with their respective gears asshown in Fig. '2; all other clutches being out of engagement with theirrespective gears except clutch F on the shaft D which is held inengagement while the rollers on the crank shaft in engagement with thatclutchare in the parallel parts of the slots 1V and M This exception iscaused by the position of the cranks K which are the reverse of thecranks K on the same pair of crank shafts and the larger diameter of thegrooved part of the clutch F engaged by the cranks K whereby when thispair of crank shaftsare partly rotated by the movement of the bar andentry of the rollers into and out of the parts M? move the clutches Eand F in opposite directions on the shafts B and D.

hen my device is constructed as described and illustrated its operationis as follows: By means of brackets A the box A. can be attached to theframe of an automobile or other structure and connected at the end B ofthe shaft B to a motive power. The sliding bar hi can be moved by alever or other suitable means attached to either end and to thestructure supporting the box A. When the bar is set in position whereall the rollers L are in the parallel parts of the slots M and M themotive power applied the shaft B and clutches thereon alone revolve. henthe bar is moved to the extreme right and the parts M operate the rightend pair of crank shafts the cranks l-Z throw the clutch E intoengagement with the gear C and throw the clutch F out of engagement withthe gear F The rotation of the shaft B is transmitted by the clutch E tothe gear C whereby a straight drive is established through the shafts Band C. A movement of the bar to the left disen gages the clutch E andmoves the clutch 1*" into engagement with the gear F and as the part Mmoves the next pair of crank shafts Y and K throw the clutches E? F intoengagement with the gears E and F whereby the transmission of power isfrom the shaft 13 through the gears E and F shaft D, gears F and C tothe shaft C with a change of speed determined by the difference in sizeof the gears E and F A further movement of the bar to the left rele sesthe clutches E and F and the part lu rotates the next pair of crankshafts and moves the clutches E and F into engagement with the gears Eand F by which another change of speed is produced, the direction of thetransmission of power be ing the same as before. The further movement ofthe bar to the left releases the clutches TE and F and operating the endpair of crank shafts moves the clutches E and F into engagement with thegears E and F whereby the motive power is transmitted through theintermediate gear G to the gear F, shafts D and 0 whereby the shafts l)and C are rotated in opposite di rection to that of the shaft B.

It is obvious that the size of the .3 gears determines the rate of theseveral speeds and of the reverse; that the space between the teeth ofthe clutches and of the gears make the shift positive and noiseless;that the slight movement of the clutches permits the highest number ofchanges in the smallest practical space, and the oil tight inclosure ofall parts.

Vhat I claim as new and by Letters Patent is:

1. A box having shaft bearings; a driving shaft and an independent shaftboth in line in said box and bearings; gear wheels rotatable on saiddriving shaftand gear wheel fixed on said independent shaft; clutchesslidable on said driving shaft and rotatable therewith, adapted toengage and rotate said wheels and said independent shaft; a countershaft parallel with said driving shaft, gear wheels rotatable on saidcounter shaft and in mesh with said wheels on said driving andindependent shafts; clutches slidably secured on said counter shaft androtatable therewith adapted to be desire to secure moved into and out ofengagement with said wheels on said counter shaft; crank shafts in saidboX in cont-act with said cliiitchcs adapted when partly rotated to moveone or more of said clutches into and out of engagement with saidwheels; a sliding bar in said box in contact with said crank shafts andadapted when moved to partly rotate one or more of said crank shafts; anintermediate gear in mesh with one of said wheels on said driving andcounter shafts whereby a reverse movement of said counter shaft isobtained as described.

2. In a device of the kind described, the combination with a supportingstructure, a plurality of shafts arranged parallel therein, gear wheelsin mesh and rotatable on said shafts, and clutches slidable on saidshafts and rotatable therewith; of double cranked rods pivotallysupported at right angles to said shafts, each rod being adapted toengage a clutch on each of said shafts, and means adapted to partlyrotate said rods and to thereby move said clutches into and out ofengagement with said gears.

3. In a device of the kind described, the combination with a supportingstructure, shafts parallel and rotatable therein, gear wheels in meshrotatable on said shafts, and clutches slidably secured on said shafts;of double cranked rods pivotally supported in said structure at rightangles to said shafts and parallel with each other, arranged in pairs,each pair adapted to engage a clutch on each of said shafts, and to movesaid clutches into and out of engagement; and means adapted to partlyrotate said rods whereby said clutches are moved into and out ofengagement.

4. In a device of the kind described, the

combination with a supporting structure,

driving and driven shafts parallel therein gears in mesh rotatable onsaid shafts, clutches slidably secured on said shafts; cranked rodsrotatably supported in pairs at right angles to said shafts inengagement with said clutches, each pair of rods being adapted to engageone of said clutches on each of said shafts and to move them into andout of engagement with said gearwheels; of a pair of said cranked rodsadapted when partly rotated to move the two l l I l l clutches engagedthereby in opposite directions, one clutch being moved into engage mentwith a gear wheel on one shaft, and the other clutch being moved out ofengagement with a gear wheel on another shaft,

and means adapted to partly rotate said cranked rods.

In a device described, the combination consisting of supporting means, adriving, counter, intern'iediate and independent shafts rotatable insaid supporting means, a plurality of gear wheels rotatably supported onsaid shafts, and a gear Wheel fixed on said independent shaft, saidgears being in mesh, a plurality of clutches slidably supported on saiddriving and counter shafts and rotatable therewith, and a plurality ofcrank shafts rotatably supported in said supporting means adapted to bepartly rotated and to thereby move said clutches into and out ofengagement with said gears; with a bar slid able in said supportingstructure adapted to be moved and operate said crank shafts whereby saidclutches, gears, and shafts are connected and disconnected and saidcounter and independent shafts rotated at various speeds and reversed asdescribed.

6. In a device as described, the combination consisting of a supportingstructure, a driving, counter, intermediate, and inclependent shaftsrotatable in said structure; a plurality of gear wheels rotatablysupported on said shafts, and a gear wheel liXed on said independentshaft, all of said gears being in mesh in said structure, a plurality ofclutches rotatable with said shafts and slidable thereon into and out ofengagement with said gear wheels; crank shafts rotatably supported insaid structure in contact with said clutches adapted when partly rotatedto move said clutches on said shafts into and out of engagement withsaid gears; with a slotted plate slidably supported in said structure,said crank shafts being engaged in the slot or slots in said plate,Where by when said plate is moved said cranks are partly rotated asdescribed.

HERMAN C. DREISVOGT.

lVitnesses THOMAS J. ldoneAN, JULIUs ltunms'rnm.

